diff --git a/XilinxProcessorIPLib/drivers/dp/src/xdp.h b/XilinxProcessorIPLib/drivers/dp/src/xdp.h
index 6d826f95..de7535cc 100644
--- a/XilinxProcessorIPLib/drivers/dp/src/xdp.h
+++ b/XilinxProcessorIPLib/drivers/dp/src/xdp.h
@@ -762,6 +762,18 @@ typedef struct {
 							passed to the training
 							pattern 3 callback
 							function. */
+	XDp_IntrHandler IntrDownReqHandler;	/**< Callback function for down
+							request interrupts. */
+	void *IntrDownReqCallbackRef;		/**< A pointer to the user data
+							passed to the down
+							request callback
+							function. */
+	XDp_IntrHandler IntrDownReplyHandler;	/**< Callback function for down
+							reply interrupts. */
+	void *IntrDownReplyCallbackRef;		/**< A pointer to the user data
+							passed to the down
+							reply callback
+							function. */
 } XDp_Rx;
 
 /**
@@ -894,6 +906,10 @@ void XDp_RxSetIntrTp2Handler(XDp *InstancePtr,
 			XDp_IntrHandler CallbackFunc, void *CallbackRef);
 void XDp_RxSetIntrTp3Handler(XDp *InstancePtr,
 			XDp_IntrHandler CallbackFunc, void *CallbackRef);
+void XDp_RxSetIntrDownReqHandler(XDp *InstancePtr,
+			XDp_IntrHandler CallbackFunc, void *CallbackRef);
+void XDp_RxSetIntrDownReplyHandler(XDp *InstancePtr,
+			XDp_IntrHandler CallbackFunc, void *CallbackRef);
 
 /* xdp_mst.c: Multi-stream transport (MST) functions for enabling or disabling
  * MST mode. */
diff --git a/XilinxProcessorIPLib/drivers/dp/src/xdp_intr.c b/XilinxProcessorIPLib/drivers/dp/src/xdp_intr.c
index 8ec4434e..83f34d4d 100644
--- a/XilinxProcessorIPLib/drivers/dp/src/xdp_intr.c
+++ b/XilinxProcessorIPLib/drivers/dp/src/xdp_intr.c
@@ -592,6 +592,62 @@ void XDp_RxSetIntrTp3Handler(XDp *InstancePtr,
 	InstancePtr->RxInstance.IntrTp3CallbackRef = CallbackRef;
 }
 
+/******************************************************************************/
+/**
+ * This function installs a callback function for when a down request interrupt
+ * occurs.
+ *
+ * @param	InstancePtr is a pointer to the XDp instance.
+ * @param	CallbackFunc is the address to the callback function.
+ * @param	CallbackRef is the user data item that will be passed to the
+ *		callback function when it is invoked.
+ *
+ * @return	None.
+ *
+ * @note	None.
+ *
+*******************************************************************************/
+void XDp_RxSetIntrDownReqHandler(XDp *InstancePtr,
+			XDp_IntrHandler CallbackFunc, void *CallbackRef)
+{
+	/* Verify arguments. */
+	Xil_AssertVoid(InstancePtr != NULL);
+	Xil_AssertVoid(XDp_GetCoreType(InstancePtr) == XDP_RX);
+	Xil_AssertVoid(CallbackFunc != NULL);
+	Xil_AssertVoid(CallbackRef != NULL);
+
+	InstancePtr->RxInstance.IntrDownReqHandler = CallbackFunc;
+	InstancePtr->RxInstance.IntrDownReqCallbackRef = CallbackRef;
+}
+
+/******************************************************************************/
+/**
+ * This function installs a callback function for when a down reply interrupt
+ * occurs.
+ *
+ * @param	InstancePtr is a pointer to the XDp instance.
+ * @param	CallbackFunc is the address to the callback function.
+ * @param	CallbackRef is the user data item that will be passed to the
+ *		callback function when it is invoked.
+ *
+ * @return	None.
+ *
+ * @note	None.
+ *
+*******************************************************************************/
+void XDp_RxSetIntrDownReplyHandler(XDp *InstancePtr,
+			XDp_IntrHandler CallbackFunc, void *CallbackRef)
+{
+	/* Verify arguments. */
+	Xil_AssertVoid(InstancePtr != NULL);
+	Xil_AssertVoid(XDp_GetCoreType(InstancePtr) == XDP_RX);
+	Xil_AssertVoid(CallbackFunc != NULL);
+	Xil_AssertVoid(CallbackRef != NULL);
+
+	InstancePtr->RxInstance.IntrDownReplyHandler = CallbackFunc;
+	InstancePtr->RxInstance.IntrDownReplyCallbackRef = CallbackRef;
+}
+
 /******************************************************************************/
 /**
  * This function is the interrupt handler for the XDp driver operating in TX
@@ -738,4 +794,10 @@ static void XDp_RxInterruptHandler(XDp *InstancePtr)
 		InstancePtr->RxInstance.IntrExtPktHandler(
 			InstancePtr->RxInstance.IntrExtPktCallbackRef);
 	}
+
+	/* The TX has issued a down request; a sideband message is ready. */
+	if (IntrStatus & XDP_RX_INTERRUPT_CAUSE_DOWN_REQUEST_MASK) {
+		InstancePtr->RxInstance.IntrDownReqHandler(
+			InstancePtr->RxInstance.IntrDownReqCallbackRef);
+	}
 }